Fountain pen



Oct. 15, 1940. G. LARSEN 2,217,755

FOUNTAIN PEN Filed March s, 1939 INVENTOR. 625716/ Larue/Z rationvr of New York Application' Marche, lssaserialnfzmss'z n f4 onims. ,ff (o1. 120;.46)

'v V' Ilriis invention relates to a noveland improved 4 form of fountain pen, the novel features'of lwhich will be"best understood from 'the 'following description and the annexed drawing; in lwhich'I 5 haveshown selected embodiments of the invention and in which:

Fig. 1 is a longitudinal view, partly in elevation and partly in section, showing one form which the invention may take;

1'! Fig. 2 is a longitudinal sectional view of part of the structure appearing in Fig. 1 but on a larger scale and showing certain parts detached and also showing part of a tool for use in assembly, this View being taken on a different plane than that of Fig. 1;

Fig. 3 is an elevation of the sac shown in Figs.

1 and 2;

Fig. 4 is a view similar to Fig. 1 but showing a diierent embodiment of the invention.

Referring first to Figs. 1, 2, and 3, I have shown therein a fountain pen comprising a barrel I having` therein a reservoir 2 and a pump chamber 3. At one end of the barrel, which for convenience may be called the lower end, is disposed any suitable feed section 4 within which is shown a suitable feed 5 and a pen point 6.

The feed is provided with the usual breather tube 'I extending upwardly into the reservoir and,

in the illustrated embodiment, the barrel is shown :iu as having a transparent section 8 whereby the level of ink in the reservoir may be determined when that level is low.

Within the pump chamber is disposed a pump sac 9 which, as is well known in the art, is of 3.-', soft resilient rubber and which may be actuated by a lever I0, for example in the mann-er disclosed and claimed in Patent 2,087,672, July 20, 1937 to Larsen et al. This sac may be inserted into the pump chamber through the upper end il; thereof in which is disposed a removable closure,

here shown in the form of a plug I I threaded into engagement with the barrel, as 'plainly indicated in Figs. l and 2. y

At the lower end of the pump chamber the barrel is formed of a-n anchor part I2 of reduced diameter and having therein a recess I3 which is preferably annular and which is adapted to receive the ange I4 of the sac 9. This flange is preferably continuous around the circumo ference of the sac, which will normally be cylindrical, and the ange is also preferably made of the same soft resilient character of rubber as the rest of the sac, but is relatively thick and heavy, as plainly shown. The anchor part I2 is joined to the wall of the chamber 3 by a tapered shoulder ls and thus it will be seenthanthe'sac1tse1fwi11 clear the Wall of the chamber.3 but thai-,when the sac is insertedy into-theope'n upper end of the chamber 'the 'an'ge- `may''be compressed enough-to slide 'along-the `chainberand be 'guided bythe.' shoulder''l 5 `into the 'recess I3 and then the resiliency of the ange will causeit'ltol snap outwardly into the recess and into engagement with the outer wall of the recess. The outside diameter of the ange is such that it will normally press against this outer wall of the recess,-but

in order to insure that the sac shall be held in position and also -to provide the necessary air passage between the sac and the reservoir, I prefer to insert in the mouth I6 of the sac a plug I1 having an aperture I8 extending through it.

When the sac has been put in the position shown.

in Fig. 2, then the plug may be engaged by a suitable tool I9 and forced into the mouth of the sac. As shown, the plug has an annular groove 20 of approximately the width of the flange I4, this forming on the plug a head 2| and a foot 22. The head 2l willpress the sac above the flange outwardly against the anchor part I2..

After the parts have been assembled as above indicated, the threaded closure I I may be put in place and the feed section may also be attached to the barrel as known in the art and 'then the pen is in condition for use. At the same time, the parts may be readily assembled when necessary for repair, since the chamber 3 is readily accessible and, by removal of the feed section and associated parts, the tool I Simay be easily inserted into engagement with the apertured plug I1 for removal of that plug.

In Fig. 4 I have shown a slightly diierent embodiment of the invention and in which similar parts are given the same numerals and will vnot be described further. In this embodiment. however, the sac 9 isrlonger than in Fig. 1 and is I claim:

1. In a fountain pen, a barrel having a recess in the inner wall thereof, a rubber sac having an outwardly extending resilient flange disposed in said recess, the outside diameter of said ange being great enough to cause the flange normally to expand into said recess, and an apertured plug within said flange and forcing it outwardly into said recess, said y plug having a head and a foot on opposite sides of said flange, for the purpose set forth.

2. In a fountain pen, a barrel having a cham'= ber, a rubber sac disposed in said chamber, at one end of said chamber said barrel having an anchor part with an inside diameter smaller than that-l of said chamber, a -tapered shoulder joining the wall of said chamber to said anchor part, said anchor part having a recess therein, and 'saidsac having a resilient ange in said recess, an

apertured plug within said flange and forcing it 3. In a fountain pen, a barrel having a recess in the inner wall thereof, a rubber sac having an outwardly extending resilient flange disposed in said recess, the outside diameter of said ange being great enough to cause the ange normally to expand into said recess, and an apertured plug within said flange and forcing it outwardly into said recess, said plug having a head disposed Within the sac interiorly of the llange thereof and of such a diameter as to'force the wall of the sac against the adjacent wall of the chamber.

l 4. In a fountain pen, a barrel having a chamber, a rubber sac disposed in said chamber, at

one end of said chamber said barrel having an l anchorpart with an inside diameter smaller than 

